Pump 1 delivers fluid to the left end of cylinder 2, moving piston 3 to the right. Fluid from the right end of cylinder 2 is discharged through flow-control valve 4 and valve 5 to the tank. Relief valve 6 maintains constant pressure in the delivery line. When the pressure increases in the right end of the cylinder and in the discharge pipeline, piston 7 of valve 5 moves to the left, increasing the pressure at the output from flow-control valve 4. Thus, the pressure drop over valve 4 is maintained constant.
$4194$CHP,Dr$